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Letters .Patent No, 82,289, v4dated September 22, 1868.

IMPROVEMENT IN saws.

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TO ALL WHOM IT MAY CONCERN:

Be Vit known that I, BENJAMIN F. BU'RGESS, of Norvell, in the county cJackson, in the State of Michigan, have invented a new and usefulA Improvement in Saws; and I do hereby declare that the following is a` full,

clear, and exact description of its construction and operation, reference being had tothe annexed drawing,

making part of this specification, in which the figure is a. side view.

The nature of my invention consists in making a. saw that will cut one way only, because the teeth are formed with unequal angles `at their edges for the purpose ot' cutting one way, so as to cut andiclear the kerf with one motion of the saw; and, to perfect the saw for that kind of use, I make the teeth in sections of ve teeth each, the forward one to be straight with the plate of the saw to clear theker, and the others are eamteeth, andset alternately to cut the kerf required, and the edge of the saw or thepdints of the teeth are made in the segment of a circle or curye, for the purpose of' having fewer teeth at work at one and the same time.

I To enable others skilled in the 'art to make and use my invention, I will proceed to describe its mode of constructionand operation.

A is the blade of the saw. The edge on which the teeth are to be made is made in the form ofthe segment vofva.Itrizleoicurve of any ferm. The teeth are made in sections of five teeth each, with space between them.

The size of the space may be varied Afor different kinds of work, as when the saw is required to cut fast the space should be larger, andalways large .enough to carry away the chips' cut o' by the preceding section of cuttingaeeth. v o

B is one of a series of cutting-teeth, of which there arc twp in each section. They are made with the angles fromthe blade unequal, the forward edge being moieat right angles with the edge of thesaw than the other, as'shown in the figure. These teeth are bevelied at the point, and bent 'outward from the bevelled side suiiicient to cause them to cut the size of kerf required.

C is oneofa series'` of cutting-teeth, similar to the teeth B. They are b evelled on the opposite side from the teeth B, and are bent out to correspond with them. f

D is a clearing-tooth. There is lone at the forward part of each section. They are made with the angles more acute than the cutting-teeth, and the forward edge is nearer. at right' angles to the blade than the cuttingteeth. The edges ofthese teeth are left square, and the teeth are made lshorter than the'cutting-teeth, and are not bent, but are left straight to traverse the middle of the kerf. These teeth are made at the forward part of eachsectiou for the purposeoi' more perfectly clearing the kerf, and giving the succeeding cutting-teeth b etter access to the uncut wood. Y,

E is a space between each section of teeth. Its size must be according` to the amount of work required of the saw, or quality of timber to be cut. As. this saw is intended to cut one way only, the space must be for,- ward of each clearing-tooth, and each space arranged according to the curve-of the cutting-edge of the saw,

and may be made deeper into the blade than the space between the teeth, as shown in the figure. Y Havingvthus fully described my invention, what claim as new, and desire to secure by Letters Patent, is

Makingv ajsa'w that is to cut one way only, with the cutting-teeth B and C, and the clearing-toothDjfox-a ward of leach section, and the space E, when constructed and all arranged as specified.

BENJAMIN F.- BURGESS.

Witnesses:

'BENJAMIN L, Hor'r, CHARLES K EtrcIInM. 

